CA-MRSA Facts MRSA is a type of Staphylococcus aureus (S. aureus) bacterial infection that is resistant to some antibiotics called beta-lactam antibiotics, like penicillin and cephalosporin. CA-MRSA stands for “community-acquired methicillin resistant staphylococcus aureus.” The label “community-acquired” means that the infection was not contracted in the hospital or care facility setting that, but out in the community. The fact that MRSA is now out in the community means that the…